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Compensation - Compensation Expense Related to Limited Partnership Units that were Not Redeemed (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Newmark Holdings Units | Limited Partnership Units        
Share-based Compensation Arrangement by Share-based Payment Award        
Limited partnership units amortization $ 7,542 $ 8,470 $ 23,862 $ 22,986